WPF开发中遇到的问题及解决系列(二):如何获取通过binding生成的ComboBox或者ListBox等的Item

将ComboBox绑定到数据源时，通常需要访问ComboBoxItem以执行某个操作。 可以通过使用ItemContainerGenerator来获取ComboBoxItem。
Xaml代码如下：

< Grid >
         < ComboBox  Height ="40"  Margin ="52,59,66,0"  Name ="cbTest"  VerticalAlignment ="Top"  IsSynchronizedWithCurrentItem ="True"  SelectionChanged ="cbTest_SelectionChanged"  ItemsSource =" {Binding} " >
             < ComboBox.ItemTemplate >
                 < DataTemplate >
                     < TextBlock  Text =" {Binding Path=Name} " />
                 </ DataTemplate >
             </ ComboBox.ItemTemplate >
         </ ComboBox >
     </ Grid >

后台代码：

     public   partial   class  Window1 : Window
     {
        public Window1()
        {
            InitializeComponent();
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            Family family = new Family();
            for (int i = 0; i < 10; i++)
            {
                Person p = new Person();
                p.Name = "Name" + i.ToString();
                family.Add(p);
            }
            this.cbTest.DataContext = family;
        }

        private void cbTest_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            //通过如下代码得到ComboBoxItem，然后对其进行操作
            ComboBoxItem cbItem = (ComboBoxItem)this.cbTest.ItemContainerGenerator.ContainerFromIndex(this.cbTest.SelectedIndex);
            if (cbItem != null)
            {
                cbItem.Background = Brushes.Red;
            }
        }
    }

     public   class  Person
     {
        public string Name
        {
            get;            
            set;
        }
    }
     public   class  Family : ObservableCollection < Person >
     { }

详见MSDN： http://msdn2.microsoft.com/zh-cn/library/system.windows.controls.itemcontainergenerator.aspx